Czechoslovak factory code "esr" on artillery cases

Has anybody ever seen the Czechoslovak factory code “esr” being used on artillery cases?

If so, images of such headstamps would be highly appreciated.


esr = SANDRIK, currently Slovakia. Dolne Hamre.
Currently, a producer of metal utensils.


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Rafal, thanks! I am aware who is behind “esr” but the issue is to find confirmation for their product range of ammunition components.